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Management of Commercially Generated Radioactive Waste - U.S. ...

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252<br />

GEOLOGIC CONSIDERATIONS<br />

made. The results <strong>of</strong> these ongoing studies will be considered in the final design <strong>of</strong> the<br />

repository system.<br />

Draft p. 3.1.54<br />

Issue<br />

The statement that for longer-lived nuclides a delay in release to groundwater will<br />

probably be provided by the host geology, is not true <strong>of</strong> salt since it does not absorb great<br />

amounts <strong>of</strong> the nuclides that leach out. (62)<br />

Response<br />

The text has been changed.<br />

Draft p. 3.1.67<br />

Issue<br />

The current geologic estimate <strong>of</strong> the age <strong>of</strong> the earth is 5 billion years, not<br />

10 billion as given. (208-NRC)<br />

Response<br />

The text has been changed.<br />

Draft p. 3.1.68<br />

Issue<br />

Lithosphere/Biosphere Transport: While the reader is correctly advised that "Some<br />

ground-water and transport models have been calibrated," he is not told that modeling <strong>of</strong><br />

flow through fractured aquifers is in its infancy. (218-DOI)<br />

Response<br />

DOE agrees with the commenter and notes that these points are well taken. Final Sec-<br />

tion 3.4.3.2 discusses the limitations <strong>of</strong> mathematical models. Appendix L <strong>of</strong> the final<br />

Statement indentifies research currently underway which is designed to better the under-<br />

standing <strong>of</strong> the nature <strong>of</strong> fracture flow, thereby, aiding in the development <strong>of</strong> more accurate<br />

fracture flow models.

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